mcs/class/System.XML/System.Xml.Schema/XmlSchemaKey.cs

   1 // Author: Dwivedi, Ajay kumar\r
   2 //            Adwiv@Yahoo.com\r
   3 using System;\r
   4 using System.Xml;\r
   5 \r
   6 namespace System.Xml.Schema\r
   7 {\r
   8         /// <summary>\r
   9         /// Summary description for XmlSchemaKey.\r
  10         /// </summary>\r
  11         public class XmlSchemaKey : XmlSchemaIdentityConstraint\r
  12         {\r
  13                 const string xmlname = "key";\r
  14 \r
  15                 public XmlSchemaKey()\r
  16                 {\r
  17                 }\r
  18                 /// <remarks>\r
  19                 /// 1. name must be present\r
  20                 /// 2. selector and field must be present\r
  21                 /// </remarks>\r
  22                 internal override int Compile(ValidationEventHandler h, XmlSchema schema)\r
  23                 {\r
  24                         return base.Compile(h, schema);\r
  25                 }\r
  26                 \r
  27                 /*\r
  28                 internal new void error(ValidationEventHandler handle, string message)\r
  29                 {\r
  30                         errorCount++;\r
  31                         ValidationHandler.RaiseValidationError(handle, this, message);\r
  32                 }\r
  33                 */\r
  34 \r
  35                 //<key \r
  36                 //  id = ID \r
  37                 //  name = NCName \r
  38                 //  {any attributes with non-schema namespace . . .}>\r
  39                 //  Content: (annotation?, (selector, field+))\r
  40                 //</key>\r
  41                 internal static XmlSchemaKey Read(XmlSchemaReader reader, ValidationEventHandler h)\r
  42                 {\r
  43                         XmlSchemaKey key = new XmlSchemaKey();\r
  44                         reader.MoveToElement();\r
  45 \r
  46                         if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != xmlname)\r
  47                         {\r
  48                                 error(h,"Should not happen :1: XmlSchemaKey.Read, name="+reader.Name,null);\r
  49                                 reader.Skip();\r
  50                                 return null;\r
  51                         }\r
  52 \r
  53                         key.LineNumber = reader.LineNumber;\r
  54                         key.LinePosition = reader.LinePosition;\r
  55                         key.SourceUri = reader.BaseURI;\r
  56 \r
  57                         while(reader.MoveToNextAttribute())\r
  58                         {\r
  59                                 if(reader.Name == "id")\r
  60                                 {\r
  61                                         key.Id = reader.Value;\r
  62                                 }\r
  63                                 else if(reader.Name == "name")\r
  64                                 {\r
  65                                         key.Name = reader.Value;\r
  66                                 }\r
  67                                 else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)\r
  68                                 {\r
  69                                         error(h,reader.Name + " is not a valid attribute for key",null);\r
  70                                 }\r
  71                                 else\r
  72                                 {\r
  73                                         XmlSchemaUtil.ReadUnhandledAttribute(reader,key);\r
  74                                 }\r
  75                         }\r
  76                         \r
  77                         reader.MoveToElement();\r
  78                         if(reader.IsEmptyElement)\r
  79                                 return key;\r
  80 \r
  81                         //  Content: annotation?, selector, field+\r
  82                         int level = 1;\r
  83                         while(reader.ReadNextElement())\r
  84                         {\r
  85                                 if(reader.NodeType == XmlNodeType.EndElement)\r
  86                                 {\r
  87                                         if(reader.LocalName != xmlname)\r
  88                                                 error(h,"Should not happen :2: XmlSchemaKey.Read, name="+reader.Name,null);\r
  89                                         break;\r
  90                                 }\r
  91                                 if(level <= 1 && reader.LocalName == "annotation")\r
  92                                 {\r
  93                                         level = 2; //Only one annotation\r
  94                                         XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);\r
  95                                         if(annotation != null)\r
  96                                                 key.Annotation = annotation;\r
  97                                         continue;\r
  98                                 }\r
  99                                 if(level <= 2 && reader.LocalName == "selector")\r
 100                                 {\r
 101                                         level = 3;\r
 102                                         XmlSchemaXPath selector = XmlSchemaXPath.Read(reader,h,"selector");\r
 103                                         if(selector != null)\r
 104                                                 key.Selector = selector;\r
 105                                         continue;\r
 106                                 }\r
 107                                 if(level <= 3 && reader.LocalName == "field")\r
 108                                 {\r
 109                                         level = 3;\r
 110                                         if(key.Selector == null)\r
 111                                                 error(h,"selector must be defined before field declarations",null);\r
 112                                         XmlSchemaXPath field = XmlSchemaXPath.Read(reader,h,"field");\r
 113                                         if(field != null)\r
 114                                                 key.Fields.Add(field);\r
 115                                         continue;\r
 116                                 }\r
 117                                 reader.RaiseInvalidElementError();\r
 118                         }\r
 119                         return key;\r
 120                 }\r
 121         }\r
 122 }\r